Kohler cartridge help

[Plumber69]

My problem is water comes out of the spout when toilet is flushed. Both bathrooms have the same kohler rough in, and the same problem. I'm looking for replacement cartridges. Only info of the body I got was 52466-AA... I see that it comes in two parts. The plastic temp control and the brass part. I want to order 2 of each parts. They must have updated the cartridge cause I can't find it online. The one I found is black not brass, looks mostly plastic to

 

[Smooky]

It's now all plastic, not brass like the old one.
http://www.us.kohler.com/us/catalog/partProductDetails.jsp?productId=637966&substituteskuId=613412

http://www.us.kohler.com/us/MIXER-CAP-KIT-(1-2-PBU-SHOWER)/productDetail/Service-Parts/637970.htm?skuId=613416&brandId=null&&_requestid=12352705#

http://www.us.kohler.com/us/CARTRIDGE--FOR-PRESSURE-BALANCING-UNIT-(SHOWER)/productDetail/Service-Parts/637956.htm?skuId=613402&brandId=null&&_requestid=12352833#